Canon Digital IXUS 500 Quick Start Manual page 82

You can set the exposure and focus separately. This is effective when the
contrast is too strong between the subject and background or when a
subject is backlit.
o
You must set the flash to The AE lock cannot be set if the flash
fires.
DISP.
g
To release the AE lock
Press the
~
button.
Press the DISP. button to turn the
LCD monitor on.
Focus on the part of the subject on
which you wish to lock the exposure
setting.
Press the shutter button halfway
(two beeps will sound) and press
the ~ button.
• The exposure setting is locked.
• The
II
icon will display.
Re-aim the camera to compose the
shot as desired and press the
shutter button fully.
74
The AE lock may be released by pressing the zoom lever, MENU
button or
~
button, or by changing the white balance, ISO speed,
photo effect or the shooting mode, or by turning the LCD monitor off.